Tex. Health & Safety Code § 481.182
For the purpose of establishing a delivery under this chapter, proof of an offer to sell must be corroborated by:
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.
Amended by Acts 2003, 78th Leg., ch. 1099, Sec. 12, eff. Sept. 1, 2003.